Source of: /manual/en/debugger-about.php
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<div id="debugger-about" class="sect1">
<h2 class="title">About debugging in PHP</h2>
<p class="simpara">
PHP does not have an internal debugging facility.
You can use one of the external debuggers though. The
<a href="http://www.zend.com/en/products/studio/" class="link external">» Zend IDE</a> includes
a debugger, and there are also some free debugger extensions
like DBG at <a href="http://dd.cron.ru/dbg/" class="link external">» http://dd.cron.ru/dbg/</a>, the
<a href="http://pecl.php.net/apd" class="link external">» Advanced PHP Debugger</a> (APD) or
<a href="http://www.xdebug.org/" class="link external">» Xdebug</a>.
</p>
</div><?php manual_footer(); ?>